block/create.c

   1 /*
   2  * Block layer code related to image creation
   3  *
   4  * Copyright (c) 2018 Kevin Wolf <kwolf@redhat.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "block/block_int.h"
  27 #include "qapi/qapi-commands-block-core.h"
  28 #include "qapi/error.h"
  29
  30 typedef struct BlockdevCreateCo {
  31     BlockDriver *drv;
  32     BlockdevCreateOptions *opts;
  33     int ret;
  34     Error **errp;
  35 } BlockdevCreateCo;
  36
  37 static void coroutine_fn bdrv_co_create_co_entry(void *opaque)
  38 {
  39     BlockdevCreateCo *cco = opaque;
  40     cco->ret = cco->drv->bdrv_co_create(cco->opts, cco->errp);
  41 }
  42
  43 void qmp_x_blockdev_create(BlockdevCreateOptions *options, Error **errp)
  44 {
  45     const char *fmt = BlockdevDriver_str(options->driver);
  46     BlockDriver *drv = bdrv_find_format(fmt);
  47     Coroutine *co;
  48     BlockdevCreateCo cco;
  49
  50     /* If the driver is in the schema, we know that it exists. But it may not
  51      * be whitelisted. */
  52     assert(drv);
  53     if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
  54         error_setg(errp, "Driver is not whitelisted");
  55         return;
  56     }
  57
  58     /* Call callback if it exists */
  59     if (!drv->bdrv_co_create) {
  60         error_setg(errp, "Driver does not support blockdev-create");
  61         return;
  62     }
  63
  64     cco = (BlockdevCreateCo) {
  65         .drv = drv,
  66         .opts = options,
  67         .ret = -EINPROGRESS,
  68         .errp = errp,
  69     };
  70
  71     co = qemu_coroutine_create(bdrv_co_create_co_entry, &cco);
  72     qemu_coroutine_enter(co);
  73     while (cco.ret == -EINPROGRESS) {
  74         aio_poll(qemu_get_aio_context(), true);
  75     }
  76 }